Manufacture of yarn



V Apn'l 9, 194s. 'M HHN 2,398,000

MANUFACTURE OF YARN Filed Feb. 2, 1944 ATTORNEY.

BY WMM.

Fatented Apr. 9, 1946 UNIT STATES ',r. "il U.

2,398,000 MANUFACTURE (or YARN Malcolm Hain, Montclair, N. J.Application February 2, 1944, Serial No. 520,766

' (ci. isi-13o) Claims.

In my Patent No. 2,197,638 I have set forth a novel mechanism fordrawing a `sliver composed of jute or other bast fibers whereby, withoutthe use of gills, the sliver may be brought to proper state forspinning. Given the usual drawing and retaining roll-pairs and aso-called driven roll between such roll-pairs, in that case a pair offreely rotative rolls were held yieldingly urged toward the driven rollsandfree to turn as a pair around an axis parallel with the axis of thedriven roll, whereby to coact with the driven roll to exert pressure onthe sliver thus to cause bers not actually nipped by the drawing rollsto be held against advance merely by fibers actually so Let I be a partof the frame of the machine.

At 2 and 2a are the drawing rolls, roll 2 being fast'to the shaft 3, androll 2a having its trunnions resting on guideways Ia of the frame whichproject toward roll 2 and said roll 2a being held pressing against roll2 by a lever 4 assumed to carry a weight (not shown) yand fulcrumed in abracket Ib of the frame, the lever exerting its pressure on the rollthrough a plunger 5. At S-Sa are the as usual iiuted retaining rollsabove the drawing rolls, roll 6 being fast to a shaft 1 and roll 6abeing journaled in the forked forward end of a lever 8 fulcrumed in theframe and, due to a weight 9 carried by the lever, serving to press rollSa against roll 6. Between the drawing and retaining lroll pairs andfast to a shaft I0 is what I herein term a driven roll II against whichis made to bear, as will appear, what I term a pressure roll Ila. Byusual gearing the rolls 2 and 6 are driven, thus: Shaft 2 being suitablydriven, a gear I2 thereon meshes with a gear I3 formed order named, butbetween the last two pairs through a spout 20, and nally through agrooved guide 2l to and through the cap 22 of the spinning unit.

The bracket 23, clamping member 24, handlever 25 to coact with member 2tto clamp the sliver, the bell-crank lever 26, link 2l and link 28 havinga projection 28a under lever t are all substantially the same as in myPatent No. 2,197,638.

Pressure roll IIa is supported by what is in effect a slideway 29alateral of the driven roll Ii andhere afforded by the upper surfaces ofarms of a bifurcated bracket 29 which is a fixed pro jection of a railIcof the machine frame, said bracket straddling the roll lia, whosetrlunnions rest on the slideway, which in this example is pitcheddownwardly toward roll lI.

. At 3D is a lever having a forked forward endv which straddles rollIIand whose forked terminals receive shaft I0 on which such lever is thusfulcrumed. The lever also has what is in effect a slideway 30a hereafforded by the under surfaces of its arms which rest on the trunnionsof roll IIa, this slideway being here pitched downwardly from roll Ii.Remote from its fulcrum the lever is here bent downward and thenrearward, its free end Supportingv a weight 3l. `Link 28 is connected tothis lever. The lever may have a sliver guide in the form of a fork 36h.f

)'The surfaces forming, the slideways provide bearings for the pressureroll.

By the gearing shown the drawing rolls 2-2a are rotated at a greaterspeed than the retaining rolls B-Ba and the roll II of the pair I I-I Iais rotated at a speed between those of the drawing and retaining rolls.

In operation, with the pressure roll Ila and `lever 30 in the positionshown, the rolls II-I Ia coacting to compress the sliver a at a point between the drawing and retaining rolls, those fibers of the sliver whichare not nipped by the drawing rolls exist compressed by the rollsII-Iha, of which roll II is rotated more slowly than the drawing rolls,and so are held against advance incident merely to such bond as existsbetween them and those actualy so nipped, wherefore the drawing proceedsuniformly. or without bunching.

If the sliver parts between the drawing rolls and the spinning unit itis desired, as in my said patent, to stop the drawing andconsequent-delivery of the sliver. For this purpose, lever 25 is movedtoward the dotted position so as to clamp the sliver and retract roll 6aand also lever 30. This leaves only the Weight of roll IIa effective tocause rolls ll--I la to clamp the sliver, wherefore the latter parts asanl incident of the clampy ing, as in my said patent, in convenientproximity to the drawing rolls.

My invention is characterized by including, with a pressure roll havingits axis substantially parallel with the axes of the drawing andretaining rolls and the driven roll, members having bearing surfacesengaging thepressure roll and converging from the sliver being drawn andnormally holding said pressure roll against the driven roll and one ofwhich members is yieldingly urged toward the other, and one of whichmembers underlies the pressure roll and has its said surface `inclineddownwardly.

against the driven roll, all said rolls being ar ranged to maintain theportion of the sliver undergoing draft in upright state and having theiraxes substantially horizontal, means to rotate one drawing roll and oneretaining roll, thev former at the superior speed, and also rotate thedriven roll at a speed between those of the latter drawing and retainingrolls, and means normally urging said pressure roll toward thedriven'roll.

2. The combination set forth in claim 1 characterized bythe last-namedmeans including a lever fulcrumed in the supportingmeans and engagingthe pressure roll.

3. A sliver drawing mechanism including, in combination, supportingmean,.drawing and retaining means including respectively, a pair ofdrawing rolls and a pair of retaining rolls lour-v naled in thesupporting means, the latter pair being above the former pair, a drivenroll jour.

naled in said supporting means substantially between said pairs, saidsupporting means having a slideway lateral of and extending and inclineddownwardly toward the driven roll, a pressure roll resting and free tomove on -the slideway against the driven roll, means to rotate onedrawing roll and one retaining roll, the former at the superior speed,and also rotate the driven roll at a speed between those ofthe latterdrawingand retaining rolls, al1 said rolls having their axessubstantially parallel, and means, including a lever fulcrumedl in thesupporting means and having a slideway engaging the pressure roll andconverging toward the first-named slideway in a direction from thedriven roll, normally urging said pressure roll toward the driven roll.

4. A sliver, drawing mechanism including, in combination, supportingmeans, drawing and retaining means including, respectively, a pair ofdrawing rolls and a pair of retaining rolls journaled in the supportingmeans, a driven roll journaled in said supporting means substantiallybeL tween said pairs, said supporting means having a slideway lateral ofand extending and incline downwardly toward the driven roll, a pressurroll resting and free to move on the slideway against the driven roll,all said rolls being arranged to maintain the portion of the sliverundergoing draft in upright state and having their 4axes substantiallyhorizontal, means to rotate one drawing roll and one retaining roll, theformer at the superior speed, and also rotate the driven roll at a speedbetween those of the latter draw- 4ing and retaining rolls, meansnormally urging said pressure roll toward the driven roll, and

means to retract the last-named-means from said driven roll and theother of the retaining rolls from the rst-named retaining roll andsimultaneously brake the sliver relatively back of said retaining rolls.

5. Mechanism for drawing sliver including supporting'structure, a pairof drawing rolls, a pair of retaining rolls and a driven rollsubstantially between said pairs, all saidrolls having their axessubstantially parallel, and means to rotate. one drawing roll and one,retaining roll, the former at the superiorispeed, and also rotate thedriven roll at a speed between those of the latter drawing and retainingrolls, said mechanism also including, with a pressure roll having itsaxis'substantlally parallel with`said axes, members having bearingsurfaces engaging the pressure roll and converging from the sliver beingdrawn and normally holding said pressure roll against the driven rolland one of which members is yieldingly urged toward the other, onemember underlying the pressure roll and having its bearing surface inlclined downwardly.

- MALCOLM HAIN.

